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Changed Contract to be a struct because if the public fields are all comparable then you can just ask for equality. There is probably a better way to return the contract string though.

Code
Diff
  • using System;
using System.Collections.Generic;
using System.Linq;

public enum Quality { SD, HD, UHD }

public class TV
{
    private struct Contract
    {
        public static Contract Premium = new Contract(4, Quality.UHD);
        public static Contract Standard = new Contract(2, Quality.HD);
        public static Contract Essential = new Contract(1, Quality.SD);
    
        public int Number;
        public Quality Quality;
    
        public Contract(int number, Quality quality) { Number = number; Quality = quality; }
    }

    public static string GetContract(int numDevices, Quality quality)
    {
        var desiredContract = new Contract(numDevices, quality);
    
        return desiredContract.Equals(Contract.Premium) ? "PREMIUM" :
          desiredContract.Equals(Contract.Standard) ? "STANDARD" :
          desiredContract.Equals(Contract.Essential) ? "ESSENTIAL" :
          "INVALID";
    }
}
    • using System;
    • using System.Collections.Generic;
    • using System.Linq;
    • public enum Quality { SD, HD, UHD }
    • public class TV
    • {
    • private class Contract
    • private struct Contract
    • {
    • public string Type;
    • public Func<int, Quality, bool> Condition;
    • public static readonly IList<Contract> Types =
    • new List<Contract>
    • {
    • new Contract { Type = "PREMIUM", Condition = (numDevices, quality) => numDevices == 4 && quality == Quality.UHD },
    • new Contract { Type = "STANDARD", Condition = (numDevices, quality) => numDevices == 2 && quality == Quality.HD },
    • new Contract { Type = "ESSENTIAL", Condition = (numDevices, quality) => numDevices == 1 && quality == Quality.SD },
    • new Contract { Type = "INVALID", Condition = (numDevices, quality) => true }
    • };
    • public static Contract Premium = new Contract(4, Quality.UHD);
    • public static Contract Standard = new Contract(2, Quality.HD);
    • public static Contract Essential = new Contract(1, Quality.SD);
    • public int Number;
    • public Quality Quality;
    • public Contract(int number, Quality quality) { Number = number; Quality = quality; }
    • }
    • public static string GetContract(int numDevices, Quality quality)
    • {
    • return Contract.Types.First(contract => contract.Condition(numDevices, quality)).Type;
    • var desiredContract = new Contract(numDevices, quality);
    • return desiredContract.Equals(Contract.Premium) ? "PREMIUM" :
    • desiredContract.Equals(Contract.Standard) ? "STANDARD" :
    • desiredContract.Equals(Contract.Essential) ? "ESSENTIAL" :
    • "INVALID";
    • }
    • }